. >>> reporter: 19-year-old dzhokhar tsarnaev is reportedly awake and responding to investigators' question. sources tell us he is writing out his answers because of a gunshot wound in his throat that has left him unable to speak. a special interrogation team from the fbi will handle the questioning. >> how did they plan this, what was the motive, did they have help and are there others ou th >> reporter: it appes johar as his older brother tamerlan were prepared to set off more bombs when police caught up with them early friday morning. >> they were going to attack other individuals. that's my belief at this point in time. >> reporter: tamerlan was killed during a shootout with police. jahar escaped but was caught friday night hiding in a boat. charges against him could be filed as early as today. the city of boston will take time to mark the one-week anniversary of the marathon bombings. at 2:50 this afternoon, the city will observe a moment of silence followed by bell ringing throughout the state. there will also be a private funeral for krystle cambell today. there was a public wake in